<template>
  <div class="login_container">
    <!-- 头像 -->
    <div class="login_box">
      <div class="avatar_box">
        <img src="../assets/logo.png" alt />
      </div>
      <!-- 登录表单 -->
      <el-form
        ref="loginFormRef"
        :model="loginForm"
        :rules="loginFormRules"
        label-width="0px"
        class="login-form"
      >
        <!-- 用戶名 -->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
        </el-form-item>
        <!-- 密碼 -->
        <el-form-item prop="password">
          <el-input
            v-model="loginForm.password"
            type="password"
            prefix-icon="iconfont icon-3702mima"
          ></el-input>
        </el-form-item>
        <!-- 按鈕 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登入</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  name: "Login",
  data() {
    return {
      loginForm: {
        username: "admin",
        password: "123456"
      },
      // 表單驗證規則對象
      loginFormRules: {
        // 驗證用戶名是否合法
        username: [
          { required: true, message: "请输入登入名称", trigger: "blur" },
          { min: 3, max: 5, message: "长度在 3 到 5 个字符", trigger: "blur" }
        ],
        //驗證密碼是否合法
        password: [
          { required: true, message: "请输入登入密碼", trigger: "blur" },
          { min: 6, max: 15, message: "长度在 6 到 15 个字符", trigger: "blur" }
        ]
      }
    };
  },
  methods: {
    // 登入
    login() {
      this.$refs.loginFormRef.validate(async valid => {
        console.log(valid);
        if (!valid) retrun;
        //解构赋值
        const { data: res } = await this.$http.post("login", this.loginForm);
        console.log(res);
        if (res.meta.status !== 200) return this.$message.error("登入失敗");
        this.$message.success("登入成功");
        //1.将登入成功之后的token，保存到客户端的sessionStorage中
        //  1.1项目中除了登入之外的其他API接口，必须在登入之后才能访问
        //  1.2token只应在当前网站打开期间有效，所以将token保存在sessionStorage中
        //2.通过编程式导航(router)跳转到后台主页，路由地址是/home
        // console.log(res);
        window.sessionStorage.setItem("token", res.data.token);
        this.$router.push("/home");
      });
    },
    //重置登入表單
    resetLoginForm() {
      this.$refs.loginFormRef.resetFields();
    }
  }
};
</script>


<style lang="less" scoped>
.login_container {
  height: 100%;
  background-color: #2b4b6b;
}
.login_box {
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}
.avatar_box {
  height: 130px;
  width: 130px;
  border: 1px solid #eee;
  border-radius: 50%;
  padding: 10px;
  box-shadow: 0 0 10px #eee;
  position: absolute;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: #fff;
  img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: #eee;
  }
}

.login-form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}

.btns {
  display: flex;
  justify-content: flex-end;
}
</style>
